I have a ton of tweaks in my blogs here... but I haven't had to deal with your problem.
If you stop all programs from running at bootup with Autoruns
and you disable all the Scheduled Tasks
and if you don't use a wireless system and turn off wlan autoconfig
and verify your drivers are working for your network card
and look for errors in the Administrattive log under custom in the Event Viewer
and STILL have the problem... after rebooting your system and your router and your modem ... then you may have to get another computer or go back to another os.